//
// impl/detached.hpp
// ~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2022 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//

#ifndef ASIO_IMPL_DETACHED_HPP
#define ASIO_IMPL_DETACHED_HPP

#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)

#include "asio/detail/config.hpp"
#include "asio/async_result.hpp"
#include "asio/detail/variadic_templates.hpp"

#include "asio/detail/push_options.hpp"

namespace asio {
    namespace detail {

        // Class to adapt a detached_t as a completion handler.
        class detached_handler {
        public:
            typedef void result_type;

            detached_handler(detached_t) {
            }

#if defined(ASIO_HAS_VARIADIC_TEMPLATES)

            template <typename... Args>
            void operator()(Args...)
            {
            }

#else // defined(ASIO_HAS_VARIADIC_TEMPLATES)

            void operator()() {
            }

#define ASIO_PRIVATE_DETACHED_DEF(n) \
    template <ASIO_VARIADIC_TPARAMS(n)> \
    void operator()(ASIO_VARIADIC_TARGS(n)) \
    { \
    } \
    /**/
            ASIO_VARIADIC_GENERATE(ASIO_PRIVATE_DETACHED_DEF)
#undef ASIO_PRIVATE_DETACHED_DEF

#endif // defined(ASIO_HAS_VARIADIC_TEMPLATES)
        };

    } // namespace detail

#if !defined(GENERATING_DOCUMENTATION)

    template<typename Signature>
    struct async_result<detached_t, Signature> {
        typedef asio::detail::detached_handler completion_handler_type;

        typedef void return_type;

        explicit async_result(completion_handler_type &) {
        }

        void get() {
        }

#if defined(ASIO_HAS_VARIADIC_TEMPLATES)

        template <typename Initiation, typename RawCompletionToken, typename... Args>
        static return_type initiate(
            ASIO_MOVE_ARG(Initiation) initiation,
            ASIO_MOVE_ARG(RawCompletionToken),
            ASIO_MOVE_ARG(Args)... args)
        {
          ASIO_MOVE_CAST(Initiation)(initiation)(
              detail::detached_handler(detached_t()),
              ASIO_MOVE_CAST(Args)(args)...);
        }

#else // defined(ASIO_HAS_VARIADIC_TEMPLATES)

        template<typename Initiation, typename RawCompletionToken>
        static return_type initiate(
                ASIO_MOVE_ARG(Initiation) initiation,
                ASIO_MOVE_ARG(RawCompletionToken)) {
            ASIO_MOVE_CAST(Initiation)(initiation)(
                    detail::detached_handler(detached_t()));
        }

#define ASIO_PRIVATE_INITIATE_DEF(n) \
  template <typename Initiation, typename RawCompletionToken, \
      ASIO_VARIADIC_TPARAMS(n)> \
  static return_type initiate( \
      ASIO_MOVE_ARG(Initiation) initiation, \
      ASIO_MOVE_ARG(RawCompletionToken), \
      ASIO_VARIADIC_MOVE_PARAMS(n)) \
  { \
    ASIO_MOVE_CAST(Initiation)(initiation)( \
        detail::detached_handler(detached_t()), \
        ASIO_VARIADIC_MOVE_ARGS(n)); \
  } \
  /**/
        ASIO_VARIADIC_GENERATE(ASIO_PRIVATE_INITIATE_DEF)
#undef ASIO_PRIVATE_INITIATE_DEF

#endif // defined(ASIO_HAS_VARIADIC_TEMPLATES)
    };

#endif // !defined(GENERATING_DOCUMENTATION)

} // namespace asio

#include "asio/detail/pop_options.hpp"

#endif // ASIO_IMPL_DETACHED_HPP
